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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61bcf3cbbeae3ce7f539f83a1342d85d49326ef3b0ff435d3aedbe7be1b72970' 
  AND token = 'HUl9z4I79tEt8Ya0UH+nW+6TBy/TbS2cKAfZpaT+Xis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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