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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec9c9b3ed68f2f862af0f99f2f2386184450aeafb7fa45d26b3eb118e02ac91' 
  AND token = 'oNGpSbEqWNO7baUUwx8ABGr4B5YT/dT4NELneTcbIX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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