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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67ed955d90b229391cc57a0191db993c0a271875364b0b0365d5256951b2f1d' 
  AND token = 'asXF55HlA04QLS+acoKCmICqPDQGacUoWF9N98gZ/m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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