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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50a3b732f8204ae634d3a9bd22c26502f1555d63012eca9492112cd3260779bf' 
  AND token = 'chCNnI/hGCgSfiQBuLteFXSsf9oIssnRKs/pYhP0q4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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