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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7385ea2a825ae8a6471c4a68f0ac1b985562c558fd47efde25bbcccfcb622f5b' 
  AND token = 'ynHK4TJironwDOujTpcjaySXKUCif2ap0+ROX9u0WP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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