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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822bab14700fcda79b3658fac92193b5375b50bc5631b6fb3e693c8dc1fcdd9c' 
  AND token = 'Ptx2E+2eNuFSJ+DeMBYI9X8J3YSoJV1H3pd4MX6+IKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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