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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1498b7f101c1c26f5b9e9520f98e0874aba6c7d57cace1f0d78a82802aef17b6' 
  AND token = 'wM/YHittQnhvmY70sUin3jDkzFRz+8LYDX33+fZky9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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