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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e8601008ca3db5859cf1695b98a19b1af679d134767919cb768bb23234eb70' 
  AND token = 'P6rW209tdD+6k1KbAuZ8H8XXQukzGT6SBffVZDj9H/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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