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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71a6b4df6e1a6dda84f63ac17b3cf0a08a785acb9ec87c4ded5a52985232783' 
  AND token = 'Tdadou/4M2wL7We+7HwSK7s7x2ipwhpPF5bydpI62nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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