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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fecb244482e0da407c576656374c2c9f41928e536aa7bc8d00d66d35835a8b52' 
  AND token = '4817k5Kn40gwt17Vo48pR7KjTuJck7YPACNxy7NVgYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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