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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba217a867ea377cf5c9009f878f3dc4c39d4b5c08c13d5c8adf0c04757c47fe5' 
  AND token = 'iJwYW2sXz6waHu2LY4L4mVetK8EsDYxBfmnRZ/KDPP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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