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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8134ebbf4c3a46d8e71f889001314ee8fd8d60fc29845877125c7308f88afb4a' 
  AND token = 'ALuq1d1QPXReL83z2q9Gjgyz2JeVR4OH3r3Df+b7QjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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