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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7663082632c292e1b52528b70a59ebe2f6bd0f6c4339cc4599e42cf2fb95ef6' 
  AND token = 'Sg9b7joX7tjHcCu39A31WBsyOR2yDa2gN8r0brOsuUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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