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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057d051b92592d1f528b110d3b6abdb954da517447e0a3b4bc4939184487e0e2' 
  AND token = 'fGdDGESom4qdxy4lyl82cGBbr4ilBoqgiILsWVvSlAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}