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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e3b5201cf2bb422ff6876ca33cb67c9ee7e2c558c1df43da7daf7c6e759508' 
  AND token = 'PKQJ3I8PeystuuV213J0lCTS9uDMZL6RpG4tabKtzr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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