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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8c3b14947d861451f33c83b393904737943c7c23bb23c10b5993da32793e1e' 
  AND token = 'hU4mvRI4IasDnUzpbjm9a+mDSSpl2F5WkkHclqYylqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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