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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f66f42a84c9cea0e19015b0314752f15fb4dc0f10fdacbc3ffe24d9d9fe2f9' 
  AND token = 'xvAaubYPB5dSkENW2L4Yjc0LunleheLIcfr1x0RvJ5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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