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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b0ecd26756a1a2f29f2f34521dc90f7fcce1fe8b537ad592275ebce91e99b3' 
  AND token = 'h/5WLPILqk1drg4bAJgXQioK7LvNsaknu8Bvvjqbhns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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