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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5310f1e12f8cc922e9e47fbda88b9e77b5d64d97e03e21411fd1f32f87872459' 
  AND token = 'qV7/21Z08s5PB/HEXhE1IKcXYTRBxjW4nEaJnRYbBMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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