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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cc5480c2c10fd9718dc8d96e5582e22223c792e70e1f12613ef50b4e7fc3b1' 
  AND token = 'i9UslCD0eY9/vIvMYNtARo+UK221fu6vCUnmNWBS9iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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