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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1862f399cc4523ebd3097649a064223e84a2d83f6ff27383b6ad1f0fd3db32de' 
  AND token = 'Aknwb7eQi7PsnB7OxJ0XExEq+2rmlI41L2f1aWFH6iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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