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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db9c22bbe4cc34d9fa244ebdadf2301a82b7b85d48443dc8d83e770177f9938' 
  AND token = '6s+WXwBeYEe9Xv3VNXQCVOPy+aIIpFFxRtfxvuerC9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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