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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6045fc7c563b168de2f26c0991aa04aa6e079408360ce55adbd681e861b6683f' 
  AND token = 'yUQHTQgg86ecSFOFTtrtanWVltWUa6FIMWiNuHUrJGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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