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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a05229b74aa2a4cd92418491aaa0a248c4088fa9abf5586469e376add0771f' 
  AND token = 'Dm1BPGI0XN/fx5IroocUr6yFW3ND5qfxcTfxhWs1vGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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