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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d83a4093196b9c81f4830c31e68c7037fd52a2beb3d3d6e9a1751d706ee8caf' 
  AND token = 'BRR8fgBmizX47c9wEpoG763gy8PISRvyfEYiL4i9Ez0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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