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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a7da584aa1f2e01f1d08790187339433ee68ae6d5f0e80249845d32ad36978' 
  AND token = '1GWZvL/ZXS8aif7BV/UK+TiPaDSmnGM6kJkPUKWeuwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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