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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95effeec023385744d20415188d3e4a2e6b1cf995a5784af2efce72368d50dc4' 
  AND token = 'IVyQq/DFnfVWGIGtujm7WjogBP1queEDDagiMmyeINY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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