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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b960c9c4cb6d3da3401a898018ae42bd26d352f1f32ddf87c9f17322994ba2fe' 
  AND token = 'THSst/QDT0uT+0zVvzQS9zHlpcV/HiQ2l12LubvuIEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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