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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36da3a2457a1f606cf11af5a4a78f0ba5931c1c0d330904f08396440ff52cdb' 
  AND token = '4tAgraXOhnXBSYWhClAgjWsLw/Vx+EkR0nZMiX+kZ48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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