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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c1adef84d25ae54bcfb79421475282ce4b4457ba5b4aa42ef1180c28bd78ae' 
  AND token = 'dErxQ4q9cDJRxi1VtoHORw5DW6pzle8dni58zx8c3Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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