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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7510ba9a4ec2409458cfe50810ae68767397ff0a0479f1570c94824203a3ef47' 
  AND token = 'UOWdT7Ntk1p5ft7S7882ImxtrfwnY0qj5j9fQn3xnjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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