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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e729e7f246e14ce7ab3f6e3b15b1594266c7f3c8c3e884974e72d3bd5a66206' 
  AND token = '1gLtTG9bML80rUWlxU8yk6Ennh7rjCHCSEhmCq82N1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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