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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdb2469ee98dd520674482f8ad4b74c015236d2dfee6937079ebf51b8c32d7a' 
  AND token = 'Rbw2+7oJQ5QoTPUdV0BQqNfyO9939vfbvS4PKau5qHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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