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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73fa47296978d93e1c39a11cdadf3cf4804d04b955fbf93366dfd4ffb25fddd' 
  AND token = 'Spc8kC5aRIE6WarEgPp/+PtV2fvULCSW6WXfAFarrmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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