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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0257d0891c543ad044e751cf60d067808257484034ed3b55370b4420340123d7' 
  AND token = 'HylmNBB9pviC9Hl29elr4T6TL+G9wYFEaCDdOuU9e9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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