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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea7b278b709c513e617289358867779d8a5c11e3036fcd8352a6a35ad75a01a' 
  AND token = '1badSbn1JYDmBPlYcG85k1ZSwaR5aptmC3jh8csVHgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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