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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ca202b62ac05dade6453e16748a988249642b7c5ef19fc2dd0796736f81c92' 
  AND token = 'ZCK+RnHeZjik9Dr7doKDx6SFEPcOdu5E+9vpHV24RWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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