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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73407290754bba79f6195a13ca6192117a86af856590ed1f400e516ff9c09398' 
  AND token = 'mg9vvPI6xKeWDslLbkPeQQ11kZjV4wO9ytu9iIVPy08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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