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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2da3787c7fc49fc1c568affac2539bd80427245c5c6f2b4b022d7e0066917ad' 
  AND token = 'K2V2m80aX5VCy+bJ4Ua/v9bx8d1R4mjbojF/fUsO6nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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