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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf51de1f4e5019c1a948fe6db718716c36aa99d0b885ef91113cf2d8d1ab198f' 
  AND token = 'KhAPVOpdjHms12iBIpU09kznBmis60rXLoqRZQmPGC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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