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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08549e28ed372052101681c39f5e96bf361a1d3307471caa340879112b070701' 
  AND token = 'WL1/X73uQJ0W0LMk9ORcDcVRKVF2Jc2suZx1bA4UW0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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