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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb22b16b0c5e0c8fe1293e4669f03fff32fa3b14adeba3281e57ce7c6a4e7910' 
  AND token = 'BIhIrFGYxinbVYjHDEO5QihHYs0r41LeCAHfytnfZC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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