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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e44f28520b947b2204c0f0b5298ea2bf58c4e0bcee16b08fe48f081711633c5' 
  AND token = 'R6TA7T6RE2Ux8lowUYb4fMhozKFYxH/aTvkQMFxL9qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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