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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf2a022bb6d3891e19e011776cb000b9e327039d74aadce6e1babbb79c36c24' 
  AND token = 'l9qS8MLey2P2d25CHsyZM0UxjqTMLN/Pr9ygUQkh7Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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