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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67aaa0ed9657be9cc42beb8af03cbcebc76a52b66e40646585ab92b5cef378b' 
  AND token = '4pha/w0MlY5BVRhPml/9+RaeDT1dbHLU93gANBdtIWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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