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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7cc3afb203a6a6e7f9444f0020dab1f5181fac67147bf49541af4c0a76e8f0a' 
  AND token = 'zUZD7alJC5HYo9XerUrDbJCFdfsWSTgl1SXaa8WWkg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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