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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b65440131a6d2ecb22a06de256f082158a97d3e4e1f2c8251ba16ce4922506' 
  AND token = 'y5XSteg6urg/YVsyaGRGpzUoaJodoQDX2sTfOyhOH5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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