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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27a0ce9ec58c06d2e8bbf190d918cedd301a9768227f04ef7d5ce8737d95dfb' 
  AND token = 'PrO4TDgxIL/mV8zXo5tOT3/Ot4u5Lm0hDLl0dMDHREU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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