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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233bc793e34dda5e0f7f651520a022bb92d9a6718b20358a27cf7316ecd20962' 
  AND token = 'zfqPx/QCAmxAGM0D822ALMw+6plAWi1xxRM6vS5o0+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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