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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54c489c04603bada6a99ec237c98bee631344b3af3e74f3e18635c0a519b16da' 
  AND token = '7kbOcu3vvdnhwyckDtkIjrIfXfPEe5IHA6moUPWscRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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