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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e91c5e126545feb6dcf39e3cb2201071bf4315e713d6a510c8d84cdaef94b0' 
  AND token = 'pbrPo4JkdMi/KgbMrYYdyl1A1/733ql7hOm3F5aIOg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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