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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '522474678903eeaf90a63a01252ed15132d9fb5298c420cff5d02b1a0c8bbee1' 
  AND token = 'gQJc7grmYFAl/HMdzs76XVnZ37D0khdndMQ5w1oV6P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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