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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe514b42f2423ff3c0f5930ebd3d5dcefb220acd49858af59099231abe48a3b' 
  AND token = 'CuSpWnMuS28KqyQfs7eWeEbaEjnkg0r6aBlnCuHd8DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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