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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b605a4c1b7c2e6356d6b0587d8426cb89cf87aed6287f7d0ccaaf06a9c1dbc1a' 
  AND token = '8Qec7G1DTvGIEAMT23lRATMoD6RK1ZCLjc9mqTmrukQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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