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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3760cc85e0582c22ad68fdf0ab0476a2cf723b8ff7c2d421616814a158f78211' 
  AND token = '/R2TZem3jNUcw0Vlwft8au/whGZuqa9ib31STIsLRWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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