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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe873b7db8c854420feb8769341b9b90e4a531c0705a61d9a28e98c1f08f766b' 
  AND token = 'j4KMybgnTEMvSocVoOmvjRHbIq9LB0PrNoHt0At2TQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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