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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f3fe77d880a725441ca5be214ffbbb38f9f65e8e4dd79c6475819cc5f6a0ae' 
  AND token = 'LmjW6TkgyDjG5wQ1JGX5a30i4nDxmcB8JOo6Ec9LzgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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