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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87dd6898d47875078fbd31880b4c5d39be5daeaa279e51ef6208f25d0cd8483' 
  AND token = 'kpsgevUWP2XJ3e6BxKereXN9lwwwSBQQxJEcjuSQJd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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