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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b6c9ace303916778c0bb882081967c744c29219c590f7f75ad3db087b061de' 
  AND token = 't3Uqo63niVOPYt5yIGTiM7EsY6UH/f8tK/18QU0gt98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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